Bottom line: Screw everything else, if two people love each other, then they love each other. People just think homosexuality isn't right, and for what reasons?
The bible says it's wrong, you can't have genetic babies, and it's wrong, most of the time. But why is it wrong? There's no reason that's good enough to look down on it. Society, in general, was taught that homosexuality is stupid and etc.,. Just like how people tell you that a monster lives in your closet and there's actually nothing there, or weave up some silly bedtime story.

As for marriage, let them have it. Heterosexual love is just the same as homosexual love, or any other.